Study of the Grüneisen Parameter of ZnO at High Pressures

Authors Binita Shah

Department of Physics, Electronics and Space Sciences, University School of Sciences, Gujarat University, Navrangpura, Ahmedabad-38009, India

Issue Volume 14, Year 2022, Number 2
Dates Received 28 February 2022; revised manuscript received 16 April 2022; published online 29 April 2022
Citation Binita Shah, J. Nano- Electron. Phys. 14 No 2, 02020 (2022)
PACS Number(s) 64.30. – t, 65.40. – b, 63.20.Ry
Keywords ZnO (81) , EOS (3) , Grüneisen parameter, Wurtzite and rock salt phase, Thermoelastic properties.

Investigations of thermoelastic properties for several types of solids is very important for researchers to understand the earth’s lower mantle structure and core at high pressure range. The Grüneisen parameter (γ) plays a very important role in the study of thermoelastic properties as it provides the fundamental basis regarding the frequency distribution of phonon spectrum in solids. In the present study, an attempt has been made to theoretically compute the pressure dependent Grüneisen parameter for wurtzite (B4) and rock salt (B1) phases of bulk and nano zinc oxide (ZnO) up to about 200 GPa. The free volume expression for the Grüneisen parameter derived by Vaschenko and Zubarev and isothermal equations of state (EOS) are used to numerate the values. We have found that the trend of variation of the Grüneisen parameter against pressure obtained for ZnO is similar to the trend obtained for other metals as per literature.

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